[3] Kothari has done his graduation from Sardar Vallabbhai National Institute of Technology, Surat and an MBA from the Indian School of Business, Hyderabad.

[5][6][7] Kothari in the year 2011 ended a two decade gold drought for his state Gujarat by finishing at 1st position in the 50 m freestyle event.

[9] Kothari was part of the gold medal winning teams in 4 × 100 m Freestyle Relay at Asian Age group Championships in both 2011 and 2015 editions.

[13] Kothari, along with the Gujarat swimming team won the gold medal and set a national record in 4 x 50m Mixed Medley Relay event with the timing of 01:53.42.

[20] He also won a silver medal in 4x100 Mixed FS Relay event (along with his teammates Sahil Chopra, Damini Gowda, and Shivani Kataria), and a bronze medal in 4X200m Relay FS event (along with his teammates Avinash Mani, Sahil Chopra, Sajan Prakash).